Mechanical stoker.



CHRISTOPHER SAMUEL DAVY, OF DULWICH, LON DON, ENGLAND, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MECHANICAL STOKER.

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application fi led October 10, 1914. Serial No. 866,039.

To all whom it may concem:

Be it known that I, CHRISTOPHER S. DAVY, a subject of the King of Great Britain, re-

' siding at Dulwich, London, England,`have of comparatively short length, and are invented certain new and useful Improvements in Mechanical Stokers, of which the followingis .aspecification.

This invention relates to mechanical stokers presenting an inclined grate surface and adapted to be fitted to the furnaces of steam generators and the like.

The invention contemplates an improved Construction of stoker wherein the fuel is forced to travel down the inclined grate surface by the sliding and pushing action of rows of 'grate elements' or bars pivotally supported on bearers or bars which extend transversely of the furnace, and made so a-s to be capable of being easily lifted out and replaced without dismountng any other art. p According to the invention the elements or bars forming the grate surface, which are placed side by side, are each formed'at one end with a jaw 'so designed as to permit of the grate bar dropping over the transverse bearer therefor and to pivot thereon; each alternate transverse bearer being supported on a rocking frame actuated by an eccentric or by cams fixed on a revolving transvers shaft, or by other suitable means, and the intermediate transverse bearers being fixed in a frame at the sides of the furnace. By the rocking or reciprocating motion of said frame, and consequent movement of the grate bars, the fuel -is pushed forward and down the bars at the same moment as the inclination of the bars is changed, a continuous variation of the thickness of the bed of fuel being thereby produced.

The invention is illustrated by way of example in the accompanying drawing which represents a longtudinal section through a furnace equipped with a mechanical stoker embodying the features above referred to.

Referring to the drawing the grate surface is formed by rows of grate elements or bars 1 and 1' each of which bars is provided at one end with a 'aw 2 which drops over the bulbous head of on of the transverse bearers or bars 3 and and rests at the opposte end upon a grate element of the row next beneath. The bearers 3 are fixed to the frame members 5, and the bearers 4 to the frame members 6. Each frame member 5 is pivoted on the shaft 7 at one end, the other end having fixed to it a quadrant 8 meshing with a toothed pinion' 9 operated by the worm wheel 10 andworm 11 on shaft 11'. The frame 5 is thus adjustable to permit the grate to be set at any desired inclination to suit the class of fuel used. Loose flanged pieces 12 may be fitted on the frame member 5 to allow for expansion in the furnace, and to prevent ingress of air between the furnace walls and the grate. i

At the lower end of the frame 5 is fitted a pivotshaft 13, upon which the lower end of each frame member 6 rests. The upper end of each frame member 6 is supported and receives a rocking motion by attachment to a link 14 operated by a lever 15 fixed to the shaft 7 The lever 15 is actuated by a lever 16, also fast on shaft 7 and to which is connected the rod of an eccentric 17 'on the shaft 18. The lever '16 is provided with a series of openings 16' so that the movements of the grate bars may be graduated by altering the position of 'the' pin at the end of the eccentric rod on thelever 16.

Owing to the rocking motion of the frame members 6 sustaining the movable bearers 4, curvilinear movements are imparted to the grate elements or bars 1' pivotally supported by said movable bearers. The magnitude of the curvilinear movements of the grate bars forming a separate row dfl'ers from that' of the movements of the gratebarsforming an adjacent row on account of the different relationship of the corresponding bearers and the pivot shaft 13.

-On the shaft 7 are mounted levers 19 'which carry a transverse `bearer 20, upon which are dropped pivoted push bars 21 disposed beneath the outlet orifice, of the feed hopper 22 and receiving, reciprocatory movements to insure that fuel from the hopper will be supplied to the grate. The push bars 21 are actuated by an, adjustable consurface by the action of the alternate rows of movable grate bars, the thickness of the fire being adapted to be graduated by rasing or lowering the furnace door 24.

The furnace may be arranged for either forced or natural draft. When forced draft s used, the front doors 25 are closed, air

- under pressure being admitted into the ash-" verse rows of grate elements, a pivoted frame in which alternate rows of said ele- A ments are supported, means for rocking said frame, and a stationary frame on which the intermediate rows o-f said elements are supported. 2. Amechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame in which alternate rows of said elements are pvotally supported, means for rocking said frame, and a statonary frame on which the intermediate rows of said elements are supported.

3. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame on which alternate rows of said elements are supported, means for rocking said pivoted frame, and a stationary frame on which the intermediate rows of said elements are pvotally supported.

4. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame in which alternate rows of said elements are supported, means for rocking said frame, a stationary frame in which the intermediate rows are pvotally supported, and means for adjusting the inclination of said frames.

5. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a frame in which alternate rows of said elements are pvotally supported, a second frame in which the intermediate rows are pvotally supported, and a pivot carried by the lastnamed frame upon which the first-named frame is supported.

6. A` mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a frame on which alternate rows of said elements are pvotally supported, and a frame on which the intermediate rows are pvotally supported, said first-named frame being pivoted upon the other frame.

7. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame on which alternate rows of said elements are pvotally supported, means adjacent one end 'of-said frame for rocking itaupon its pivot,

and a stationary frame upon which the intermediate rows of said elements are pivotally supported.

8. A mechanical stoker having an inclined grate surface formed by a plurality of transverse .rows of` grate elements, a pivoted-frame on which some of said elements are supported, and a stationary frame on which the remainder of said elements are pvotally supported, and means for rocking the pvotally supported frame.

9. A mechanical stoker having an inclined grate surface formed by a plurality of trans- Verse rows of grate elements, a pivoted frame carrying bearers upon which alternate rows of said elements are pvotally supported, a stationary frame also carrying bearers upon which the intermediate rows of said elements are pvotally supported, the elements of the intermediate rows resting at their outer ends upon the grate elements' of the row next beneath, and means for rocking said pivoted frame.

10. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame on which alternate rows of said elements are pvotally supported, means for.

rocking said frame, a second pivoted frame on which the intermediate rows of said elements are supported, said last-named frame carrying the support upon which the firstnamed frame is pivoted, and means for varyring the angle of inclination of the grate surace.

11. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, two frames in which said elements are pvotally supported, and means for producing a relative rocking movement between the frames.

12. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a frame in which alternate rows of said elements are p'votally supported, a second frame in which the intermediate elements are pvotally supported, and means for producing a relative rocking movement between said frames.

13. A mechanical stoker having an inclined grate surface formed by a plurality of transverse rows of grate elements, a pivoted frame carrying bearers having bulbous heads on which alternate rows of said elements are pivoted, a stationary frame carrying bearers also having bulbous heads on which the intermediate rows of said elements are pivoted, and means for rocking said pivoted frame.

14. A mechanical stoker having an inclined grate surface formed by transverse rows of grate elements, two frames one of which is pvotally supported upon the other,

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one of said frames carrying some of said signed my name in the presence of two subelements and the other frame the remainderw scribing witnesses. of said elements, and a suppot for both of CHRISTOPHER SAMUEL DAVY sad frames about Whch theu' lower ends v 5 may be raised or lowered to vary the inclinawitnesses:

tion of the grate surface. HENRY PELHAM SMITH,

In testinony whereof I have hereunto WILLIAM GEORGE CRUICKSHANK. 

